During engine start, selecting GRD provides electrical power to which system and displays engine parameters?

During engine start, selecting GRD provides electrical power to which system and displays engine parameters?

• A. Electrical power to the EEC and displays pointers and digits for all engine parameters
• B. Electrical power to the EEC only
• C. Pneumatic power to the EEC
• D. Hydraulic power to the EEC

Answer: (B)

GRD powers the Engine Electronic Control (EEC) with electrical power. The EEC is the engine’s control brain, responsible for starting, sequencing fuel and ignition, and reading sensors to manage engine parameters. Providing power to the EEC during start lets it perform its self-checks and begin controlling the engine, and it allows engine data to be shown to the crew through the EEC’s displays. This power path does not energize pneumatic or hydraulic systems, and it does not energize the entire set of cockpit engine indicators just from the GRD position. So the right choice is electrical power to the EEC only.

GRD powers the Engine Electronic Control (EEC) with electrical power. The EEC is the engine’s control brain, responsible for starting, sequencing fuel and ignition, and reading sensors to manage engine parameters. Providing power to the EEC during start lets it perform its self-checks and begin controlling the engine, and it allows engine data to be shown to the crew through the EEC’s displays. This power path does not energize pneumatic or hydraulic systems, and it does not energize the entire set of cockpit engine indicators just from the GRD position. So the right choice is electrical power to the EEC only.